They Are Billions Calliope Build Better

Because of Calliope’s passive buff, you should not isolate her. Build your Barracks and Engineering Centers near your perimeter walls.

To build better, you must first understand the tool. Calliope is not just a unit; she is a force multiplier. Her kit revolves around two distinct advantages:

This means a Calliope build isn't just about keeping her alive; it’s about building a base designed to maximize her "Performance."

“They are billions” is a promise of overwhelming odds. To survive, a player must not only build—they must build better. The Calliope build rejects the false security of slow, heavy defense in favor of rapid, distributed, and aggressive suppression. It teaches the player to value rate of fire over alpha damage, redundancy over brute strength, and proactive defense over reactive panic. For those willing to step away from the Ballista comfort zone, the Calliope offers a path to cleaner expansions, fewer restarts, and the quiet satisfaction of watching a wave dissolve into a cloud of blood and steam before it ever touches your walls. Build better. Build Calliope.

Calliope is arguably the most versatile hero in They Are Billions. To make her truly "better," you need to lean into her high mobility and crowd-control potential. The "Phantom Ranger" Build

This build focuses on Calliope's role as a fast-response scout and hit-and-run specialist.

Priority 1: Movement Speed & Attack RateCalliope’s greatest asset is her speed. Maximize her Movement Speed early so she can kite huge swarms without taking damage. Follow this with Attack Rate upgrades to ensure she can clear small groups while on the move.

Priority 2: Piercing Shot & DamageUnlike Caelus, Calliope struggles with high-armor targets. Invest in Damage and her Piercing abilities. This allows her dual pistols to shred through lines of "runners" and "shamblers" efficiently. they are billions calliope build better

Priority 3: Range & Critical ChanceIncreasing her Range allows her to pick off Spitters before they can launch acid. Critical Chance synergizes perfectly with her high fire rate, turning her into a single-target assassin against Harpies and Executives. Key Gameplay Tips

Kiting is King: Never let Calliope stand still during a wave. Use "Attack-Move" commands to keep her at the edge of her range.

Early Game Scout: Use her speed to uncover the map and find resource pick-ups faster than any other unit.

The Spitter Counter: Because she is faster than most infected, use her to bait Spitter attacks away from your stationary soldiers or walls.

In the post-apocalyptic strategy game They Are Billions is the fast, dual-pistol-wielding hero specialized in hit-and-run tactics. Building her effectively requires leaning into her agility while mitigating her fragile nature. Strategic Priorities for Calliope

To optimize Calliope, you must prioritize her ability to clear rooms before enemies can close the distance. Her lower health pool compared to Caelus makes "deadly speed" her best defense. Attack Speed is King

: Calliope’s primary strength is her high fire rate. Investing in attack speed early allows her to "stutter-step" (moving between shots) more effectively, keeping her out of reach of slow-moving infected. The Mobility Edge Because of Calliope’s passive buff, you should not

: She already has superior movement speed. Enhancing this further is not just for convenience; it allows you to kite high-threat enemies like Harpies and Executives around obstacles indefinitely. Range Over Armor

: Because Calliope is easily "two-shotted" by Harpies, increasing her attack range is vital. Killing a threat before it reaches her is always safer than trying to "tank" the hit with armor. The Life vs. Armor Debate : Mathematical analysis of her perk tree suggests that

is consistently better than Armor for Calliope. If you must take a defensive node to reach a damage perk, choose HP to avoid being burst down by sudden spikes in damage. Steam Community Essential Perk Pathing

When leveling Calliope through the campaign, focus on these specific upgrades to maximize her "glass cannon" potential: Damage Nodes

: Absolute priority. Her low base damage per shot means every point of flat damage significantly reduces the number of bullets required per kill. Grenade Utility

: Grenades are her "panic button." They do not damage Calliope herself, so a common pro-tip is to throw a grenade at your own feet as a Harpy lunges toward you. Vision & Range

: These allow you to clear "fog of war" in tactical missions safely, preventing you from being cornered in tight corridors. Steam Community Tactics for Survival Stutter-Stepping This means a Calliope build isn't just about

: Never stand still. Shoot, move back, and shoot again. This maximizes the distance between her and the horde.

: Use her speed to pull small groups of infected away from larger swarms. The Harpy Counter

: Harpies are her greatest threat. If you cannot kill them at range, use a medkit immediately after the first hit or pre-fire a grenade in their path.

If you'd like to dive deeper into her specific mission strategies, I can help you with: tactical mission order for early points. A comparison of her vs. for high-difficulty runs. Detailed walkthroughs for missions like The Foundry The Last Bunker

Hero and Perk test results :: They Are Billions General Discussions

Calliope is not an island. If you want to build better overall, you need to invest campaign research points into upgrades that specifically benefit her.

Critics will argue that the Calliope lacks the single-target damage to stop a Harpy or a Spitter. This is true but misleading. By the time special infected appear (day 50+), the Calliope build has already enabled such a robust economy that the player can afford to add Ballistae or Snipers on towers. The Calliope is not a replacement for all defenses; it is the bridge that carries the colony through the most vulnerable mid-game. Furthermore, the Calliope’s rapid fire is excellent at staggering Spitters, canceling their attack animation—a hidden utility that veteran players exploit.

Another critique is that the Calliope’s high fire rate wastes damage on overkill against weak infected. In practice, overkill is irrelevant when the threat is numerical saturation. Wasting a few bullets is preferable to wasting an entire colony to a breached wall.

Building better stats is worthless if you control her poorly. Here is the pro-level micro guide for Calliope.